What is the structure of the missing reagents A and B below? 
Definitions:
Memory B Cell
Forms during a primary immune response but enters a resting phase until a secondary immune response occurs.
Rapid Antibody Response
An immediate immune reaction by the body producing antibodies to defend against harmful pathogens.
Complement System
Collective name for a series of proteins in the blood, some of which act as enzymes and activators, which bind to antibodies and may lead to rupture of a foreign cell.
Plasma Proteins
Proteins in blood plasma that perform a wide range of functions including clotting, defense against pathogens, and transport of substances.
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